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1.- Earth roads: a practical guide to earth road construction and maintenance
Hindson, Jack
London: Intermediate Technology Publications, 1983
IV/1-8-9
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2.- Spoil heaps and lagoons
Thomson, G. Mckechnie; Eccles, D.E; Rodin, S.; Webb, S.B.
Londres: National coal Board, 1973
National Coal Board. Technical Handbook
IV/4-3-20
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